If you already installed KNOX bootloader (found in Samsung 4.3 stock firmware and higher) then you should know that the latter verifies signatures of loaded kernels and recoveries. As a result, no custom ones can be installed without voiding the KNOX warranty. Actually, there is no known way to reset this warranty flag. Do not continue if you want to keep your warranty with your KNOX enabled firmware/bootloader.

Flashing the Echoe custom ROM does not modify your already installed bootloader and modem making this ROM of big interest.

Preliminary Setup

Note that the Samsung Kiesalso installs the USB drivers. However, Kies is known to cause problems when Odin is attempting to communicate with your device, so ensure it is really closed (use Windows Task Manager to kill it and its related processes if you need to).

Press and hold Volume Down + Power + Home buttons simultaneously. Release the buttons only when the Warning!! message appears.

Press Volume Up button to enter into Download mode.

– Connect your device to your PC with the Samsung USB Cable. Odin should now recognize the device and the ID:COM field should turn yellow. This means that it has detected your device without a problem.

– Click Start. Wait a couple of minutes until the following conditions are met:

The ID:COM box turns green and says PASS!.

The log box displays all threads completed.

– The flashing operation is complete. Exit Odin and unplug the USB cable.